Inspection Procedure

Check voltage between each terminal of the Power Seat Control Switch and SGND of Seat Position Control ECU connector.

Fig 1: Checking Voltage Between Each Terminal Of Power Seat Control Switch & SGND Of Seat Position Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

PREPARATION:

Remove Seat Position Control ECU with connectors still connected.

CHECK:

Measure voltage between each terminal of the Power Seat Control Switch and SGND of Seat Position Control ECU connector. (The illustration shows inspection of the reclining as an example.)

OK:

EACH TERMINAL SWITCH POSITION VOLTAGE

At Each Terminal With Switch ON	0 V
At Each Terminal With Switch OFF	10 - 14 V

OK: Proceed to next circuit inspection shown in problem symptom table (See PROBLEM SYMPTOMS TABLE ).

NG: Go to next step.

Check power seat control switch.

Fig 2: Checking Power Seat Control Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

PREPARATION:

Remove seat.
Disconnect power seat control switch.

CHECK:

Check continuity between terminals when switch operated.

OK:

DRIVER'S SEAT SLIDE SWITCH CONTINUITY

Switch Position	Tester Connection	Specified Condition
FRONT	1 - 9	Continuity
BACK	1 - 6	Continuity

DRIVER'S SEAT FRONT VERTICAL SWITCH CONTINUITY

Switch Position	Tester Connection	Specified Condition
UP	1 - 5	Continuity
DOWN	1 - 10	Continuity

DRIVER'S SEAT LIFTER SWITCH CONTINUITY

Switch Position	Tester Connection	Specified Condition
UP	1 - 8	Continuity
DOWN	1 - 7	Continuity

DRIVER'S SEAT RECLINING SWITCH CONTINUITY

Switch Position	Tester Connection	Specified Condition
FORWARD	1 - 3	Continuity
REAR	1 - 2	Continuity

PASSENGER'S SLIDE SWITCH CONTINUITY

Switch Position	Tester Connection	Specified Condition
FRONT	1 - 9	Continuity
BACK	1 - 6	Continuity

PASSENGER'S FRONT VERTICAL SWITCH CONTINUITY

Switch Position	Tester Connection	Specified Condition
UP	1 - 10	Continuity
DOWN	1 - 5	Continuity

PASSENGER'S LIFTER SWITCH CONTINUITY

Switch Position	Tester Connection	Specified Condition
UP	1 - 7	Continuity
DOWN	1 - 8	Continuity

PASSENGER'S RECLINING SWITCH CONTINUITY

Switch Position	Tester Connection	Specified Condition
FORWARD	1 - 3	Continuity
REAR	1 - 2	Continuity

NG: Replace power seat control switch.

OK: Go to next step.

Check harness and connectors between Seat Position Control ECU and power seat control switch (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
NG: Repair or replace harness or connector.

OK: Check and replace Seat Position Control ECU.